It's Canada's most famous ongoing whodunnit. More than five years after the murders of the billionaire couple, the case is still open, the police are still chasing leads, and reporters are still getting new tips. But that hasn't resulted in a concrete suspect ... yet.

Why not? What makes this case so hard to crack? And so compelling to the public? What could have been done earlier to make a difference in the information available? What are we still learning now? What might we learn in the months to come? And why does the reporter who has spent years investigating this case believe that we will, eventually, crack it?

GUEST: Kevin Donovan, chief investigative reporter, Toronto Star; host of The Billionaire Murders podcast

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